lundell



2 SheetsSheet 1.

(No Model.)

B. LUNDELL.

DYNAMO ELEGTRIO MACHINE.

Patented Jan. 31, 1893. n

@3731 MA Cation x21 2 Sheets-Sheet 2.

(No Model.)

B. LUNDELL. Y DYNAMO ELECTRIC MACHINE. No] 490,809.

Patented Jan. '31, 1893.

v moamtoz 3513 M 6mm gm,

V'U ITED STATES PATENT OFFICE.

' ROBERT LUNDELL, on BROOKLYN, ASSIGNOR or TWO-THIRDS TO EDWARD H.JOHNSON, OF YORK, N. Y.

DY, NAMO-E LECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 490,809, dated January31, 1893.

Application filed April 22,1892. Serial No. 430,2 00. (No model.)

duce a machine of this type which can be.

cheaply constructed and quickly and easily taken apart for repairs.Second to adapt such a machine for use directly with the source of poweras by direct connection to the engine shafting. Third to secure theseveral parts of the armature in such manner as to materially increasethe efiiciency ofv the machine and render it less liable to damage dueto the centrifugal and other strains. Fourth to facilitate theadjustment of the armature as a whole relatively to the field poles ofthe machine. Fifth to simplifythe field magnet construction and obtainthereby a structure of great mechanical strength with minimum magneticleakage. Sixth to so dispose the iron in the machine as to affordlarge-heat radiating capacity and thereby keep it cool; and I accomplishthese several objects with the complete machine hereinafter described,the essentially novel features of which are particularly pointed out inthe claims at the end of this specification.

In order that my invention may be fully understood reference is had tothe following specification which is a full, clear and exact descriptionof the entire machine, and also to the accompanying drawings in whichlike letters of reference represent like parts wherever used. I

Figure 1 is a side 'elevational view of my novel machine, parts beingbroken away to fullyillustratetheinteriorconstruction. Fig. 2 is asectional View taken on line 2-2 Fig. land as seen looking in thedirection of the arrows on the right. Fig. 3 is an enlarged detail sideelevational view of a part of the ar-. mature, parts being brokenawayand in section to fully disclose the manner ofsecuring the individualbobbins or coils. .Fig. 4 is a perspective view of three adjoiningarmature bobbins or coils showing also their interior and exteri0r orend connections.

Prior to my invention the armatures of machines of the disk armaturetype were made by what may be very properly termed zig zag winding. Thatis to say the armature coil wasbuilt up of one continuous fiat strip ofinsulated conducting copper wound in zigzag lines round and round untilthe desired ficulty is found in adjusting and maintaining the disk inthe open magnetic field and free from actual mechanical contact with thepoles of the field magnets. Furthermore with machines so constructed thearmature windings become badly distorted when rapidly rotated owing tothe action of the centrifugal force and the drag or pull of the fieldmagnets thereon. My improved machine is designed to overcome all such'obections.

Referring now to the drawings in detail.

.M M represent a two part field magnet core of disk shape heldtogethcrbylbolts b'b'and sustained by a base B directly on the engineframe, not shown. The part M- is separable, as shown in Fig. 1, 0 beinga single field magnet coil lying on one side of the armature and in aplane substantially parallel therewith, the individual coils thereofbeing wound in a trough shaped ring F of vegetable fiber or analogousinsulating material and held in go place in a groove between the twoparts of M. This coil is energized either by a separate exciter or maybe self excited as will be fully understood by skilled electricians. The

magnetic field in which the armature A re- 5 volves is'made upofmulti'pleradially dis posed pole pieces P P &c. on one side and P P&c. on the other; one set being of north or plus, and the other of southor minus polarity. The armature shaft Swhich is pref- 10o erablyconnected directly to the engine or other source of power is journaledin bearings not shown but adapted to surround the rings 1' r r andthereby prevent end thrust.

D is the armature supporting hub orcollar which is secured by one ormore keys in the 5 faces of the shaft b, and O is a flat clamping ringor disk secured to the part D by bolts b b &c. The hub or collar D isadapted to slide cndwise on the end of the armature shaft and is givensuch movement by a screw 8 secured bya pin t to a cap piece K whichinturn is secured by four screws b" b b b entering corresponding screwholes in the hub. The cap piece K is provided with twelve holes locatedat equal distances apart. The screw 8 has a pitch of eight threads perinch so that one complete revolution of the cap piece would advance orretreat it one eighth of an inch. It is apparent therefore, that onetwelfth of a revolution'would change the adjustment one ninety sixth ofan inch. The armature supporting hub or collar D may therefore beadvanced or retracted as desired and the screws b b b b secured inplace, thereby effecting the most delicate lateral movement withrelation to the opposing multipolar field poles P P and P P &c.

G and G are the brush or contact ringsinsulated from each other and thehub D by vegetable fiber or analogous rings E E and secured in the usualway. The current collecting brushes (not shown) would hear on thelateral or end faces of these rings, as will be obvious on inspection ofFig. 2. These rings are connected'at intervals of say sixty degrees byinsulated conductors w w with the-ends of the armature coils orbobbinsA, there being shown forty eight such coils joined in six seriessets of eight in each series.

I will now describe the manner of building the armature. I takeanarrowfiat strip,preferably of ins'ulated copper or other non-magneticconducting material and of the desired length to constitute one bobbinor coil. This strip is wound firmly round and round upon itself and thering thus made is placed in the open end of one of the thin metallicyoke .picces N (see Fig. 3) so that its outer face bears against thestrip of insulatingmaterial c on the inner face of a metal block (1,screwthreaded on the inner end of a draw boltb which is alsoscrew-threadedlhrough the base of the yoke N. Additional insulatingmate.- rial i is now placed under the free ends of the yoke N and on theinside of the coil and the rivet 1) passed through it and the free endof the yoke N and the ends finally securely riveted. The draw bolt 11 isnow turned so as to make the coil assume the curvature of the block (Zafter which the coil is placed in a former which gives it substantiallythe shape it is to assume when all the coils are in their finalposition. After they are all thus built up they are assembled on thelateral face of the hub or collar D with the draw bolts 19 b projectingthrough radial bolt holes as shown, and with strips of insulatingmaterial between their adjoining edges. The ring'or disk 0 is then laidin position on hub D the bolts b b tightened slightly so as toaccurately maintain allof the yokes N and their sustained coils in oneplane. The nuts on the inner ends of the draw bolts 1)? b &c. are thentight-' ened up as are also the nuts on bolts b b and in this manner'the coils are caused to mass themselves into a frigid disk ring. Theouter portions of the coils are now secured by single layer windings ofstrong thin insulated wire w 202.

An examination of Figs. 3 and 4 will reveal the manner of connecting thesucceeding ends to the collector rings in any preferred manner or thatthe machine may be provided with commutators for rectifying the currentin such manner as to make it a direct or continuous current machine.

By the disk or annular construction of the .field core with multipleradial pole piecesl am enabled to utilize a single field coiland toobtain maximum efficiency with'a minimum amount of magnetic leakage.With such a structure I also present a maximum heat radiating surfacethereby preventing undue heating of the iron. The ventilating holes Iaround the core permit the armature bobbins to draw air through themachine over and around the coil, the armature and the field polesthereby keeping the entire machine cool and avoiding great waste ofenergy.

Having thus described my invention, what I claim and desire tosecure byLetters Patent of the United States is:

1. A dynamo electric machine having. a disk armature and a single fieldmagnet coil lying in a plane on one side of said armature .and parallelthereto, in combination with radially disposed multipolar pole piecesbetween which the armature rotates, substantially as described.

2. A dynamo electric machine having a disk armature and a single fieldmagnet core provided with radially disposed multipolar pole piecesmagnetized by a single field magnet coil lying in a plane on one side ofsaid arma ture and parallel thereto, substantially as described.

3. A dynamo electric machine having a single'field magnet coil, 9.single field magnet core with radially disposed pole pieces and a diskarmature, the field magnet coil being located on one sid a of thearmature with its windings located in planes substantially at rightangles to the armature shaft substantially as described.

4. A dynamo electric machine having a single cylindrical field magnetcore with a single net core surrounding or inclosing a single net coiland energizing field magnet coil and provided with radially dis p'osedmultipolar-field magnet. poles embracing an armature which rotates ina'plane parallel-with the inner end of the energizing coil substantiallyas described.

46. A hollow cylindrical or disk shaped field magnet core inclosing anenergizing field'magmagnet polestary armature armature and the fieldmagnet coil being situ ated in independentparallel planes substanofoppositepolarity and a rotially as described.

7. A hollow ring shaped fieldmagnet core inclosing an energizing fieldmagnet coil said field magnet corebeing provided 'with .multi: polarpole pieces of sets of pole pieces side of the 'fiel I shown anddescribed. H 4 i 8. A hollow rig shaped field/magnet core provided withmultipolar pole pieces and ven- I bobbins which whereby theymay roundingtilating holes all 'of the pole pieces being located on ue side of thefield magnet coil substantially, as described and shown.

. 9. A bellow ring shaped field magnet core I made in threeannularpieces inclosing or sura single energizing field magnet coil and havingmultipolar 'pole in twointegrallsets both located on the same side ofthe field; magnetcoil substantially as shown. I 10. Ahollo'w ring shapedifield magnet core having twosin'tegral setsfof multipolar pole piecesenergized 'byla single inclosed coil both sets of pole pieces beinglocated 01f the coil substantially as shown. 11. A disk armature made upof a series of flat bobbins each provided with an independent adjustableclamping device and all secured to a hub or scribed. j p

12. A disk armature made up of a series of bear laterally against eachother and each provided with adjustable means secured to'a carryingcollar or hub be securely held against centrifugal action, substantiallyas described.

13. A disk armature made up of individual sectional bobbins providedwith clamps and means for securing them all to a common colcolla-r.substantially as delar or hub,jas described.

14:. A disk armature made up of a series of flat elongated bobbinsconnected at their inj not" ends by independent adjustable yokes andbolts to a hub or-collar, in combination provided with multipolarlfield" located betweensaidpoles the opposite polarity both beinglocatedon the samed magnet coil substantially asv fieldmagnet coil'andpieces arranged chine, substantially as described.

- 16.; Adisk armature carriedby ashaft hav ing means for preventing endthrust, in com- 1 .bination with means for moving the armature theshaft, and additional in either direction on means for. adj ustingt'hearmature on the shaft in the direction of-its rotation substantially. asdescribed.

l7. .Adisk armature secured toa hub having longitud'nal in combinationwith means for moving the hub in either direction onthe shaft,- and ad-.ditional ineansfor adjusting the 'armatureon the'shaft in .thedirectionof its rotationsub- .stantially as described.

18. An armature carried by-a hub keyed to *and'having -slid'rngmotion'on a rotary shaft, in combination with screw; threaded adjustingconnections for accurately adjusting the position ofthearm'ature, thelength of the armature shaft and additional means for'adjusting theposition of the armature on the shaft in the direction of its rotationsubstantially as described.

19. A ringshaped field magnet core having multipolar field polesradially disposed and a flat or disk armature adapted to rotate be tweensaid poles and connected to a rotaryshaft by adjusting deviceswhereby'it may be maintained in the-magnetic field out of mechanicalcontact with the field poles, substan tially as described. 7.

in the direction of 21. A dynamo electric machine'having its 1 fieldmagnet core-n1ade of disk shape inclosing the field magnet coil andprovided with ventilating holes for admitting air to the interior of themachine, substantially asdescribed.

I 22. A dynamo electric machine having its field magnet core made ofring or disk like shape with radially disposed multipolar pole piecesbetween which the armature rotates in combination with a singlemagnetizing coil inclosed within the core and ventilating holes for,admitting air-to the interior of the ma I ROBERT LUNDELL. Witnesses: a

(LJ. KINTNER,

G. M. CHAMBERLAIN.

a hollow ring or

